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package engine
import (
"context"
"io"
"log"
"net/http"
"strings"
"time"
"vpnem/internal/config"
"vpnem/internal/models"
)
// WatchdogConfig holds watchdog parameters.
type WatchdogConfig struct {
CheckInterval time.Duration // how often to check sing-box is alive (default 2s)
DeepCheckInterval time.Duration // how often to verify exit IP (default 30s)
ReconnectCooldown time.Duration // min time between reconnect attempts (default 5s)
}
// DefaultWatchdogConfig returns the default watchdog settings (from vpn.py).
func DefaultWatchdogConfig() WatchdogConfig {
return WatchdogConfig{
CheckInterval: 2 * time.Second,
DeepCheckInterval: 30 * time.Second,
ReconnectCooldown: 5 * time.Second,
}
}
// Watchdog monitors sing-box and auto-reconnects on failure.
type Watchdog struct {
engine *Engine
cfg WatchdogConfig
cancel context.CancelFunc
running bool
// Reconnect parameters (set via StartWatching)
server models.Server
mode config.Mode
ruleSets []models.RuleSet
serverIPs []string
}
// NewWatchdog creates a new watchdog for the given engine.
func NewWatchdog(engine *Engine, cfg WatchdogConfig) *Watchdog {
return &Watchdog{
engine: engine,
cfg: cfg,
}
}
// StartWatching begins monitoring. It stores the connection params for reconnection.
func (w *Watchdog) StartWatching(server models.Server, mode config.Mode, ruleSets []models.RuleSet, serverIPs []string) {
w.StopWatching()
w.server = server
w.mode = mode
w.ruleSets = ruleSets
w.serverIPs = serverIPs
ctx, cancel := context.WithCancel(context.Background())
w.cancel = cancel
w.running = true
go w.loop(ctx)
}
// StopWatching stops the watchdog.
func (w *Watchdog) StopWatching() {
if w.cancel != nil {
w.cancel()
}
w.running = false
}
// IsWatching returns whether the watchdog is active.
func (w *Watchdog) IsWatching() bool {
return w.running
}
func (w *Watchdog) loop(ctx context.Context) {
ticker := time.NewTicker(w.cfg.CheckInterval)
defer ticker.Stop()
deepTicker := time.NewTicker(w.cfg.DeepCheckInterval)
defer deepTicker.Stop()
lastReconnect := time.Time{}
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
if !w.engine.IsRunning() {
if time.Since(lastReconnect) < w.cfg.ReconnectCooldown {
continue
}
log.Println("watchdog: sing-box not running, reconnecting...")
if err := w.engine.Start(w.server, w.mode, w.ruleSets, w.serverIPs); err != nil {
log.Printf("watchdog: reconnect failed: %v", err)
} else {
log.Println("watchdog: reconnected successfully")
}
lastReconnect = time.Now()
}
case <-deepTicker.C:
if !w.engine.IsRunning() {
continue
}
ip := checkExitIP()
if ip == "" {
log.Println("watchdog: deep check failed (no exit IP), restarting...")
if time.Since(lastReconnect) < w.cfg.ReconnectCooldown {
continue
}
if err := w.engine.Restart(w.server, w.mode, w.ruleSets, w.serverIPs); err != nil {
log.Printf("watchdog: restart failed: %v", err)
}
lastReconnect = time.Now()
}
}
}
}
func checkExitIP() string {
client := &http.Client{Timeout: 5 * time.Second}
resp, err := client.Get("http://ifconfig.me/ip")
if err != nil {
return ""
}
defer resp.Body.Close()
body, err := io.ReadAll(io.LimitReader(resp.Body, 64))
if err != nil {
return ""
}
return strings.TrimSpace(string(body))
}
|
